Worksheet 586 · Skill 3

Dead reckoning

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1. At 1135 you fix your position 168°T, 1.6 nm from Tern Island tower. You steer 285°T at 8.0 kn until 1220, then 156°T at 7.3 kn until 1255.

   Give the 1255 DR position as the true bearing FROM Heron Point Light to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Heron Point Light: ________ °T   Distance: ________ nm  

2. At 0805 you fix your position 343°T, 1.7 nm from Tern Island tower. You steer 226°T at 6.8 kn until 0825, then 141°T at 6.1 kn until 0845.

   Give the 0845 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

3. At 1050 you fix your position 088°T, 2.6 nm from Gannet Rock daybeacon. You steer 158°T at 4.5 kn until 1100, then 192°T at 7.3 kn until 1115.

   Give the 1115 DR position as the true bearing FROM Kittle water tank to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Kittle water tank: ________ °T   Distance: ________ nm  

4. At 0730 you fix your position 067°T, 2.9 nm from Westfield church spire. You steer 098°T at 6.1 kn until 0750, then 186°T at 7.7 kn until 0810.

   Give the 0810 DR position as the true bearing FROM Heron Point Light to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Heron Point Light: ________ °T   Distance: ________ nm  

5. At 1025 you fix your position 162°T, 0.9 nm from Gannet Rock daybeacon. You steer 293°T at 4.0 kn until 1100, then 236°T at 5.5 kn until 1110.

   Give the 1110 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

6. At 0905 you fix your position 021°T, 3.7 nm from Westfield church spire. You steer 163°T at 8.3 kn until 0930, then 121°T at 4.4 kn until 1005.

   Give the 1005 DR position as the true bearing FROM Heron Point Light to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Heron Point Light: ________ °T   Distance: ________ nm  

7. At 0725 you fix your position 074°T, 2.8 nm from Tern Island tower. You steer 358°T at 6.6 kn until 0735, then 192°T at 7.5 kn until 0755.

   Give the 0755 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

8. At 1050 you fix your position 075°T, 1.3 nm from Westfield church spire. You steer 026°T at 5.9 kn until 1100, then 184°T at 6.6 kn until 1130.

   Give the 1130 DR position as the true bearing FROM Heron Point Light to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Heron Point Light: ________ °T   Distance: ________ nm